Investec has said it was not surprised by Ofgem's move to refer the UK energy market for a full competition investigation, saying it should be a positive for the industry."We believe this is an opportunity to restore investor trust in an important part of the GB energy market, which has recently been dogged by political commentary and policy uncertainties. The CMA is required to publish its final report by Xmas Day 2015. Hopefully the Xmas lights will not flicker beforehand."The broker said its view on stocks in the sector remains unchanged despite the developments, as it kept 'buy' ratings on Drax and SSE and a 'sell' stance on Centrica.UBS has said that the positive fundamentals of the UK housebuilding sector remain unchanged despite measures by the Bank of England announced on Thursday to cool the housing market.It said that while a "policy over-reaction" is undoubtedly the biggest risk to the sector, this risk has already been largely priced into the market and that future intervention will be "gradual and measured". Berkeley Group and Taylor Wimpey are the bank's top picks.UBS has downgraded its rating for aerospace engineer Meggitt from 'buy' to 'neutral' and lowered its target price from 520p to 505p on the back of worsening currency movements.UBS said the stock has outperformed the FTSE 100 by 11% since reaching a low of 445p in March and is now trading just above its new target price of 505p.BC